Thecentury

using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;

namespace _6652
{
	class Program
	{

Thecentury

let coins = [50;22;19;17;10;7;5;3;2;1;1;1;1;1] |> List.sortBy (fun x -> -x)

let rec take coins coin = 
    match coins with
    | x::xs when x > coin -> take xs coin
    | x::xs when x < coin -> []
    | x::xs when x = coin -> xs
    | [] -> []

let rec change (coins:list<int>) (amt:int) = 

Thecentury

using System;
using System.Threading.Tasks;

namespace SelectMany
{
	public static class SelectManyExtensions
	{
		public static Func<TResult> SelectMany<T1, T2, TResult>( this Func<T1> f1, Func<T1, Func<T2>> selector,
			Func<T1, T2, TResult> resultSelector )
		{